Finish the c32ncp.c/c32ncp.h to ncpapi.c/ncpapi.h rename.
Update the build files, include directives, dependency tracking, header guard,
README references and file-level comments to use the new ncpapi naming. This
matches the current split where ncpapi contains the ncpXX_YY_* protocol API
wrappers and ncpcall contains the lower-level requester/transport helpers.
No behavior change.
Rename the remaining Client32 transport helper symbols from Probe-style names
to request-style names.
These helpers are no longer only diagnostic probes; they are the low-level
requester paths used by the NCP API wrappers. Rename the raw5 helper to the
more general ncp_raw_request() name and update the MapVar/OpenRef helpers to
ncp_mapvar_request() and ncp_openref_request().
No behavior change.
Rename the remaining C32-prefixed transport helpers, probe helpers, types and
constants to protocol-oriented NCP names.
This removes implementation-oriented c32/C32 naming from the shared NCP API and
transport layer while keeping the current c32ncp.c/c32ncp.h file names until
the later ncpapi.c/ncpapi.h rename. The new names avoid conflicts by using
ncp_* helper names and NCP_* type/constant prefixes.
No behavior change.
Add GPL-2-or-later license headers to the DOS utility source files and
document the purpose and local dependencies of each C, header and assembler
file.
Preserve the original Martin Stover copyright attribution for the historic
MARS-NWE utility sources, including files that did not previously carry an
explicit header but are part of the original tool set. Add Mario Fetka as the
2026 copyright holder for the current maintenance work, and use Mario-only
headers for files without original Martin Stover ownership.
Also add a root-level COPYING file containing the GPL-2 license text.
